My phone was working fine up to about a couple of hours ago. Since that time I have done nothing different to my plan or to the phone itself. However, now it wont send messages. I can still access the internet and my email and such, but all my messages will send about 95% of the way through, then stop. It states a red question mark and "not delivered". I cant figure out whats wrong. Ive reset the network settings, turned the phone off, dialed *228 and the such to no avail.